BACK DOOR CLOSER SYSTEM, Diagnostic DTC:B2251

DTC Code DTC Name
B2251 Back Door Closer Switch Malfunction

DESCRIPTION

The multiplex network door ECU receives signals from the half latch switch, initial switch, pawl switch and back door courtesy switch, which are built into the back door lock assembly. Based on these switch signals, the latch position of the back door lock assembly is determined.

DTC No. Detection Item DTC Detection Condition Trouble Area
B2251 Back Door Closer Switch Malfunction While the back door closer is operating, a malfunction is detected in position information from the back door courtesy switch within a specified amount of time.

  • Back door lock assembly

  • Harness or connector

  • Multiplex network door ECU

WIRING DIAGRAM

Figure 1. w/ Power Back Door System

B003PHAE04

Figure 2. w/o Power Back Door System

B003PHAE05

CAUTION / NOTICE / HINT

Note


  • If the replacement, removal and installation of the multiplex network door ECU or disconnection of the connectors of the multiplex network door ECU has been performed, initialize the power back door system*.

    Click here

  • The back door closer system uses the meter / gauge system function. First, confirm that there is no malfunction in the meter / gauge system. Refer to the How to Proceed with Troubleshooting procedure.

    Click here


  • *: w/ Power Back Door System

PROCEDURE


  1. READ VALUE USING GTS


    1. Read the Data List according to the display on the GTS.

      Click here


      Body Electrical > Back Door > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Courtesy SW Back door courtesy switch signal ON or OFF

      ON: Back door open

      OFF: Back door closed

      		 *: Refer to "CONSTRUCTION AND OPERATION"

      *: Refer to "CONSTRUCTION AND OPERATION"

      Click here


      Body Electrical > Back Door > Data List
      Tester Display
      Courtesy SW
      OK
      The display is as specified in the normal condition column.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MULTIPLEX NETWORK DOOR ECU Click here

    NG

  2. INSPECT BACK DOOR LOCK ASSEMBLY


    1. Remove the back door lock assembly.

      Click here

    2. Inspect the back door lock assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BACK DOOR LOCK ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK ASSEMBLY - MULTIPLEX NETWORK DOOR ECU AND BODY GROUND)


    1. w/ Power Back Door System:


      1. Disconnect the V23 back door lock assembly connector.

      2. Disconnect the V12 multiplex network door ECU connector.

      3. Disconnect the G9 combination meter assembly connector.

      4. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        V23-4 (CTY) - V12-20 (FUL) Always Below 1 Ω
        V23-1 (E) - Body ground Always Below 1 Ω
        V23-4 (CTY) or V12-20 (FUL) - Body ground Always 10 kΩ or higher

    2. w/o Power Back Door System:


      1. Disconnect the V23 back door lock assembly connector.

      2. Disconnect the V25 multiplex network door ECU connector.

      3. Disconnect the G9 combination meter assembly connector.

      4. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        V23-4 (CTY) - V25-20 (FUL) Always Below 1 Ω
        V23-1 (E) - Body ground Always Below 1 Ω
        V23-4 (CTY) or V25-20 (FUL) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MULTIPLEX NETWORK DOOR ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR